popping from carb |
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cphase
Gold Member Joined: May-11-2010 Location: Newnan, GA Status: Offline Points: 795 |
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mcfunnymoney
Newbie Joined: August-31-2013 Location: chattanooga tn Status: Offline Points: 26 |
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Just figured I would give an update. I installed the new choke housing (I bought the whole thing), adjusted it properly which was easy, and no major change. It idled like a champ for about two minutes and then did the same thing. I sprayed carb cleaner around and where the venturi shaft goes into the primary under the choke it idled up a bit. But other than that no change. I checked the carb plate with a straightedge and it was fine as well as the gaskets. I have a friend who is a mechanic coming over tuesday to look at it with me. Hopefully this does the trick. My wife has named the boat the "SS Bad Decision" Im at a loss as to what to do next.
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ArtCozier
Platinum Member Joined: April-25-2012 Location: Orlando FL Status: Offline Points: 1023 |
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Hope that your wife has her tongue planted firmly in her cheek when she says that. It's never good when they are serious about critisizing our boats!
Ask your mechanic friend to go over the coil/resistor/choke wiring. If the choke is wired to the coil side of the resistor, it will pull the voltage so low that it might affect the performance of the coil. Art |
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"Art"
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mcfunnymoney
Newbie Joined: August-31-2013 Location: chattanooga tn Status: Offline Points: 26 |
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Haha. Yes, she is just joking. That name is just between us. Will do with the choke. It seemed to work fine when I turned the key. It slowly opened up the butterfly. One question though. The fast idle portion of the choke doesn't seem to be long enough to hit the fast idle cam. I have been idling it up a bit manually on cold starts. Would that affect anything other than it not idling itself up?
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backfoot100
Platinum Member Joined: January-03-2007 Location: United States Status: Offline Points: 1897 |
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Marine carbs don't have a fast idle cam like auto carbs do. Fast idle is accomplished with the throttle.
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When people run down to the lake to see what's making that noise, you've succeeded.
Eddie |
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ArtCozier
Platinum Member Joined: April-25-2012 Location: Orlando FL Status: Offline Points: 1023 |
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Backfoot is correct. (though not a Craft) I am assuming that you have the marine version of the Holley 4160, which is the original carb for a 351. If it isn't that, all bets are off. The fast idle is intentionally disabled on the marine version. They dont't want you putting it in gear on fast idle.
It is easy to identify the marine version of this carb; the bowl vents are shaped like an inverted "U" with a squarish hole in the bottoms of them. The automotive version has straight vents cut at an angle. Art |
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"Art"
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mcfunnymoney
Newbie Joined: August-31-2013 Location: chattanooga tn Status: Offline Points: 26 |
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Well I have an admission. When I rebuilt the carb I used the wrong gasket between the base plate and the body. I will definitely never do that again. It stinks being wrong or making a mistake but it Im happy that I finally figured it out. Good sleep tonight. Thank you for all of the help and ideas. The boat idles great and starts great also. I hate to admit it but there is one more problem. It wont rev past 2k rpms. when I punch it the tack drops to 1k and it bogs. When loaded the carb secondaries dump as they should etc. My mechanic friend had to leave before much digging last night but he was fairly confident I had a weak spark or it was weakening with rpm's . I'm happy to start a new thread if necessary. I don't know the format here. Again, thank you guys so much for everything so far. The boat thanks you too!
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phatsat67
Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6157 |
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Does it sound like its spinning more than 1000 rpms? The tach is hooked directly to the ignition system and usually shows problems if something happens to the signal or something shorts with RPM.
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mcfunnymoney
Newbie Joined: August-31-2013 Location: chattanooga tn Status: Offline Points: 26 |
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It will spin up to 2k then bog and not go any further. It sounds like its running out of power (electricity) It seems to be advancing with a timing light. The springs are unbroken and recently have been cleaned and oiled. Weak coil? Bad resister? I set the points at .018 when they were new two weeks ago. New cap, rotor, condenser.
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phatsat67
Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6157 |
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Possibly, Got a spare coil or know someone?
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mcfunnymoney
Newbie Joined: August-31-2013 Location: chattanooga tn Status: Offline Points: 26 |
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I have a vw bug. I can steal that one and give it a shot
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phatsat67
Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6157 |
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Fair enough.
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5698 |
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If you changed all that you had the plug wires off.. check the firing order, then check it again. If you have low voltage to the coil (would need to check it under load) you could experience similar symtoms as well. A great big ignition wire bypassing the switch and going straight to the battery would be a decent test |
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phatsat67
Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6157 |
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+1. Buy a multimeter and a test light. They will be your best friends when testing anything electrical.
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ArtCozier
Platinum Member Joined: April-25-2012 Location: Orlando FL Status: Offline Points: 1023 |
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I'm still concerned that the choke heater might be hooked up to the wrong side of the resistor. Run the engine and after it's warmed up, unplug the positive wire off the choke housing and see whether the engine behaves normally.
Unplugging the wire will take the choke's load off of the ignition system and raise the voltage some. Whatever coil you try needs to be a non-internal resistor type coil. Some have resistors in them. Don't know anything about VWs. Art |
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"Art"
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phatsat67
Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6157 |
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It probably has a bosh on it and the coil type is determined by the housing color. Blue, red, etc.
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mcfunnymoney
Newbie Joined: August-31-2013 Location: chattanooga tn Status: Offline Points: 26 |
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The coil on the vw is red in color. I have a test light and voltmeter. What is a good bench test for a coil? Or is it ok the throw the vw one on it and try that? I will be able to run the boat tonight and unhook the choke wires.
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phatsat67
Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6157 |
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Search bosh coil types and find out if its internally or externally resisted. I think the blue coil is the internally resisted but I could be wrong.
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mcfunnymoney
Newbie Joined: August-31-2013 Location: chattanooga tn Status: Offline Points: 26 |
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My mechanic friend came over again tonight and we took a look in the distributor. We compared the old points to the new ones. The spring on the old points was significantly stouter than the one on the new points. I checked the kit after searching the forum and seeing a similar post about the weaker spring floating the points above 2000rpm and did not find another spring or a helper spring. After re-installing the old points the boat purrs like a kitten and revs like it should. Thanks again for everything. Its such a beneficial tool to have advice from experience at my fingertips. Needless to say I have ordered a new set of points with a stronger spring.
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phatsat67
Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6157 |
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Cake!
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ArtCozier
Platinum Member Joined: April-25-2012 Location: Orlando FL Status: Offline Points: 1023 |
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Glad to hear that one is solved!
Art |
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"Art"
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5698 |
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Always nice when we get the ending of the story - congrats.
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